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- W75958730 abstract "A study of the oxidation of o-xylene, n-butane, benzene, n-pentane, 1-pentene and a mixture of C4-C5 hydrocarbons on three commercial catalysts for the synthesis of anydrides was carried out. Oxidation of o-xylene was the easiest reaction to achieve, obtaining in all cases phthalic anhydride in high amount, while oxidation of n-paraffins to selective oxidation products was the most difficult reaction to achieve, obtaining high amount of maleic anhydride only using vanadia-phosporous based catalyst. V-P mixed oxide is the most polyfunctional catalyst because it gave high anhydride yields in the oxidation of all the feedstocks, excepted olefins. Vanadia-molybdenum based catalyst gave high yield in anhydrides only in oxidation of o-xylene and benzene and some interesting selectivity in oxidation of olefins. Vanadia-titania based catalyst gave selective oxidation products only in oxidation of o-xylene. It is proposed that differences in selectivity in oxidation of o-xylene and benzene are due to different type and/or reactivity of intermediates. In particular it is suggested that in o-xylene transformation to phthalic anhydride phthalide is an intermediate for a less selective pathway while a dialdehyde species adsorbed on the catalytic surface is the intermediate in selective oxidation of o-xylene. Besides in n-paraffins oxidation V-P gave higher selectivity in anhydrides than V-Mo. This is attributed to different capabilities of the two catalysts to promote dehydrogenation and oxygen insertion reactions." @default.
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- W75958730 date "1994-01-01" @default.
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- W75958730 title "Production of Maleic and Phthalic Anhydrides by Selective Vapor Phase Oxidation with Vanadium Oxide Based Catalysts" @default.
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- W75958730 doi "https://doi.org/10.1016/s0167-2991(08)63414-x" @default.
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